是动词
seen是完成时态。
seen:
v.看见见到看出看得见看有视力观看(比赛、电视节目、演出等)。
see的过去分词。 扩展资料 
I can't see any future in this relationship.
我看不出这个关系会有什么前途。
Down through the years this town has seen many changes.
这些年来这座城市发生了许多变化。
Now let me see ─ how old is she now?
让我想一想,她现在多大了呢
I'll see what I can do to help.
我考虑考虑,看我能帮上什么忙。